Safety device for refrigerating machines



Feb. 27, 1923,

E. A. RIOTTE.

SAFETY DEVICE FOR REFRIGERATING MACHINES.

HLEDJUNE14,1920.

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Patented Feb. 27, 1923.;

"EUGENE A. RIDE T0 (117 whoin Be it known that sarn'rr nnvroa an, or rrrannassis'r, new roan.

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Application filed June 14,1920. 7 Serial lilo. 388,722.

it may concern l, EUGENE A.-

citizen of the United States of America, re-

siding at Manhasset, New Yorl 5 rented a new anduseful Refrigerating Machines,

have in- Safety bevice for of which the fol- ,lowing is a specification.

My invention relates particularly to a deride intended for 11S8 W1i3h a machine of the intermittent absorption type, using ammonia as the refrigerant. lt has been proposed to employ a safety device or valve in connection with the still or other part of the apparatus which may be subjected to pressure,

valve includ which device or es a frangible disc. I have found that such discs must conform accurately to the proper design and standard of the apparatus in or functlon at cumstances.

der to be certain that it will any time under the proper c r- To insure this, it is essent al that the disc shall be of uniform and standard pattern chine.

remove the To make sure that especially designed for the mall specially construct a casso that while it is possible to old disc, it is impossible to re=- place it with an ordinary fiat disc, and so that a specially formed disc conforming generally to the standard must be employed.

Fig. 1 1s a vertical section of one form of device embodying the improvements of my invention.

Fig. 2 is cially formed Fig. 3 is a slight modification.

The casing consists of the two and 6, which hold b-le diaphragm a perspective view of the spe disc.

a fragmentary section showing parts 5 between them the frangior disc 7. The parts of the casing may be secured together conveniently,

as for insta nce, by series of bolts 8. The

part 5 of the casing is preferably provided with a stem 10 adapted or still. or

or extension 9 having a passage to be connected to the generator such other part of the apparatus which it is desired to protect. Another part of the casing is provided with an extens1on 11 having a passage 12 through which the gas is adapted to be led oil to some point for absorption or dissipation. One part of the casing is provided with a specially formed boss 13, and the other part with a recess 14. The diaphragm or disc is shaped generally to correspond with the boss 13.

Preferably i t is substantially hemispherical.

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such a standard The margin or rim 15 of the disc is clamped between the edges of the-parts of the easing. Preferably a gasket 16 is employed to insure a. gas-tight joint. The margin of the disc may be designed to receive the bolts 3 as shown in Figs. 1 and 2, or it may be shaped. as shown in Fig. 3. The gasket 16 may be seated in a shallow groove to make arbetter joint with a minimum quantity of material. In operation, if the gas pressure in the passage 10 beneath the disc or diaphragm 7 exceeds a certain limit, the disc will break and the gas will be allowed to escape through the passage 12. It will be readily understood that it is desirable that the breaking point of the disc corresponds with I the requirements ef the machine or appai'atus, and if it were possible to substitute for the disc any ordinary piece of metal, the breaking polnt would be likely to be so high that the apparatus would blow up before the disc would burst. Such a conditionwould make the machine too dangerous for ordinary use, -l[ have found that a thin disc of silver or other metal having similar pro-perties of uniformity and permanency when pressed orshaped hemi-spherically is reliable and satisfactory for this purpose.

These discs need be for ordinary purposes very thin, that is, only a few thousandths of an inch thick. It will be obvious from inspection that where. one form of the casing has a boss 13, it will be impossible to use an ordinary flat disc. The owner is therefore obliged to procure from the manufacturer or his agent a proper standard disc or diaphragm which will have the proper breaking strength or breaking point. Although I have shown the disc as hemi-spherical and the boss 13 substantially corresponding in shape, it should be understood that I do not consider the invention limited in its broader aspect to this special shape, nor to the special material mentioned.

ll claim: 5

1. A safety device of the character described comprising a casing and a frangible disc, the parts being so shaped that it is impossible to substitute a flat disc.

2. scribed comprising a casing having a raised boss and a frangible disc having a correspongingly shaped boss.

3. A safety device of the character described comprising a casing having a raised.

A safety device of the character de-- lllti boss and a frangible disc having a hemispherical boss superposed on said raised boss.

4:. A safety device of the' character described comprising a casing having a raised loj-b oss and aifrangible disc having a correspondingly shaped boss, and a gasket for the rim of said disc.

' 6. Asafety device of the character denaaassa scribed comprising a casing having a boss and a silver disc fitting over said boss.

7. A safety device comprising a base having a raised boss with a gas passage, a companion member, afrangible member extending over said boss and bolts for clamping said parts together.

8. A safety device comprising two parts, one having'an inlet and the other having an outlet, a frangible member mounted between said parts and means for preventing the insertion of a fiat disc between said parts.

EUGENE A. RIOTTE. 

